Once again on Windows (11 very up-to-date), trying to update from the app, I noticed the Amazon possibility after the PayPal payment was failing.
Tried it, and this time got a strict clue as to why both are failing.
Please see the attached screenshot, which should be very clear…
Aeon Timeline
Version: 3.4.10
Shell Version: 3.3.12
Opening Mode: about.editor
Operating System: Windows 10
Device Model: 82UG
p.s. your copy-from-about lies – this is Windows 11